linux-kernel - [PATCH 1/5] drm/amdkfd: Add KFD_IOCTL_SVM_ATTR

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Message-ID: <20251112072910.3716944-2-honglei1.huang@amd.com>
Date: Wed, 12 Nov 2025 15:29:06 +0800
From: Honglei Huang <honglei1.huang@....com>
To: <Felix.Kuehling@....com>, <alexander.deucher@....com>,
	<christian.koenig@....com>, <Ray.Huang@....com>
CC: <dmitry.osipenko@...labora.com>, <Xinhui.Pan@....com>,
	<airlied@...il.com>, <daniel@...ll.ch>, <amd-gfx@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <akpm@...ux-foundation.org>, <honghuang@....com>,
	Honglei Huang <Honglei1.Huang@....com>
Subject: [PATCH 1/5] drm/amdkfd: Add KFD_IOCTL_SVM_ATTR_MAPPED attribute

From: Honglei Huang <Honglei1.Huang@....com>

Add a new SVM attribute type to indicate whether a memory range is
a special mapped VMA (VM_PFNMAP or VM_MIXEDMAP). This attribute will
be used to support non-contiguous memory mappings in SVM ranges.

The MAPPED attribute allows the driver to distinguish between regular
anonymous memory and pre-mapped device or reserved memory regions,
enabling different handling paths for page pinning and GPU mapping.

Signed-off-by: Honglei Huang <Honglei1.Huang@....com>
---
 include/uapi/linux/kfd_ioctl.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
index 2040a470ddb4..320a4a0e10bc 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -703,6 +703,7 @@ enum kfd_ioctl_svm_location {
  * @KFD_IOCTL_SVM_ATTR_CLR_FLAGS: bitmask of flags to clear
  * @KFD_IOCTL_SVM_ATTR_GRANULARITY: migration granularity
  *                                  (log2 num pages)
+ * @KFD_IOCTL_SVM_ATTR_MAPPED: indicates whether the range is VM_PFNMAP or VM_MIXEDMAP
  */
 enum kfd_ioctl_svm_attr_type {
 	KFD_IOCTL_SVM_ATTR_PREFERRED_LOC,
@@ -712,7 +713,8 @@ enum kfd_ioctl_svm_attr_type {
 	KFD_IOCTL_SVM_ATTR_NO_ACCESS,
 	KFD_IOCTL_SVM_ATTR_SET_FLAGS,
 	KFD_IOCTL_SVM_ATTR_CLR_FLAGS,
-	KFD_IOCTL_SVM_ATTR_GRANULARITY
+	KFD_IOCTL_SVM_ATTR_GRANULARITY,
+	KFD_IOCTL_SVM_ATTR_MAPPED
 };
 
 /**
-- 
2.34.1